Electric drive axle system and automobile

Abstract

Provided are an electric drive axle system (100) and an automobile. The electric drive axle system (100) comprises an electric drive axle main body (110), two drive electric motors (120), a planetary reduction device (130) and a transmission gear (140), wherein an output shaft of at least one of the two drive electric motors (120) is in transmission connection with the planetary reduction device (130); the planetary reduction device (130) is located between the drive electric motor (120) and the transmission gear (140), and the planetary reduction device (130) comprises a shell (131), an inner ring gear (132), a sun gear (133), a planetary gear (134) and a planetary carrier (135); the inner ring gear (132) is fixedly arranged in the shell (131); the sun gear (133) is in coaxial transmission connection with the output shaft of the drive electric motor (120); the planetary gear (134) is connected between the sun gear (133) and the inner ring gear (132) in an engaging manner; an input shaft of the planetary carrier (135) is rotatably connected to the center of the planetary gear (134), and an output shaft of the planetary carrier (134) is in coaxial transmission connection with the transmission gear (140); and the transmission gear (140) is in transmission connection with an input end of the electric drive axle main body (110). Provided are the electric drive axle system (100) and the automobile, of which the oil churning losses are small.

Description

Electric drive axle system and automobile

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 12, 2023, with application number 202310692983.9 and application name “Electric Drive Axle System and Automobile”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the field of automobile electric drive axles, and in particular to an electric drive axle system and an automobile. Background Art

[0003] The electric drive axle is an important mechanism located in the chassis of new energy vehicles and is used to transmit the speed and torque of the motor to the wheels.

[0004] The motor of the current electric drive axle is often directly connected to the cylindrical gear transmission, and then meshed with other parts of the electric drive axle through the cylindrical gear to drive the wheels.

[0005] However, under this transmission mode, the oil churning loss of the car is often large.

[0006] Summary of the Invention

[0007] In order to solve at least one of the problems mentioned in the background technology, the present invention provides an electric drive axle system and a vehicle with low oil churning loss.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] In the first aspect, the present invention provides an electric drive axle system, including an electric drive axle body, two drive motors, a planetary reduction device and a transmission gear. The output shaft of at least one of the two drive motors is transmission-connected to the planetary reduction device, and the planetary reduction device is located between the drive motor and the transmission gear; the planetary reduction device includes an outer shell, an inner ring gear, a sun gear, planetary gears and a planetary carrier. The inner ring gear is fixedly arranged in the outer shell, the sun gear is coaxially transmission-connected to the output shaft of the drive motor, the planetary gears are meshed and connected between the sun gear and the inner ring gear, the input shaft of the planetary carrier is rotatably connected to the center of the planetary gear, the output shaft of the planetary carrier is coaxially transmission-connected to the transmission gear, and the transmission gear is transmission-connected to the input end of the electric drive axle body.

[0010] As an optional implementation, the planetary gear includes two cylindrical gears, and the planetary carrier includes two input shafts, and the two input shafts are rotatably connected to the centers of the two planetary gears respectively.

[0011] As an optional embodiment, the planetary gear includes two double gears, and the double gears include first meshing teeth and second meshing teeth. The first meshing teeth and the second meshing teeth are coaxial and fixedly connected together at intervals. The first meshing teeth are meshed with the inner ring gear, and the second meshing teeth are meshed with the sun gear.

[0012] As an optional implementation, the diameter of the first meshing tooth is smaller than the diameter of the second meshing tooth.

[0013] As an optional embodiment, it further includes a one-way bearing, the inner ring of the one-way bearing is mounted on the output shaft of the planetary carrier, and the transmission gear is mounted on the outer ring of the one-way bearing.

[0014] As an optional implementation, two drive motors are arranged on both sides of the electric drive axle body along the first horizontal direction.

[0015] As an optional embodiment, there are two planetary reduction gears, which are symmetrically arranged on both sides of the electric drive axle body along the first horizontal direction.

[0016] As an optional implementation, the output shafts of the two drive motors and the output shaft of the planetary carrier both extend along a second horizontal direction, and the second horizontal direction is perpendicular to the first horizontal direction.

[0017] As an optional embodiment, it further includes a housing, and the two drive motors and the planetary reduction gear are all mounted on the housing.

[0018] In a second aspect, the present invention further provides an automobile comprising any one of the dual-motor electric drive axle systems in the first aspect.

[0019] The electric drive axle system provided by the present invention includes an electric drive axle body, two drive motors, a planetary reduction gear, and a transmission gear. The output shaft of at least one of the two drive motors is transmission-connected to the planetary reduction gear, and the planetary reduction gear is located between the drive motor and the transmission gear. The planetary reduction gear includes a housing, an inner ring gear, a sun gear, planetary gears, and a planet carrier. The inner ring gear is fixedly disposed within the housing. The sun gear is coaxially transmission-connected to the output shaft of the drive motor. The planetary gears are meshingly connected between the sun gear and the inner ring gear. The input shaft of the planet carrier is rotatably connected to the center of the planetary gear. The output shaft of the planet carrier is coaxially transmission-connected to the transmission gear, and the transmission gear is transmission-connected to the input end of the electric drive axle body. The electric drive axle system provided by the present invention is provided with a planetary reduction gear at the output shaft end of the drive motor. The drive motor can transmit its own power to the transmission gear in sequence through the sun gear, the planetary gears, and the planet carrier. The power is then transmitted to the electric drive axle body through the transmission gear, thereby driving the wheels. In this way, even when the motor speed is high, the speed of the transmission gear can be relatively low, thereby reducing oil churning loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] FIG1 is a schematic diagram of a first structure of an electric drive axle system provided by an embodiment of the present invention;

[0022] FIG2 is a schematic diagram of a second structure of an electric drive axle system provided by an embodiment of the present invention;

[0023] FIG3 is a schematic diagram of a third structure of an electric drive axle system provided by an embodiment of the present invention;

[0024] FIG4 is a fourth structural schematic diagram of an electric drive axle system provided by an embodiment of the present invention.

[0025] Explanation of the accompanying reference numerals: 100 - electric drive axle system; 110 - electric drive axle body; 120 - drive motor; 130 - planetary reduction gear; 131 - housing; 132 - inner ring gear; 133 - sun gear; 134 - planetary gear; 1341 - first meshing tooth; 1342 - second meshing tooth; 135 - planetary carrier; 140 - transmission gear; 150 - one-way bearing; 200 - wheel; Y - first horizontal direction; X - second horizontal direction. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe the present invention and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0028] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0029] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0030] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0031] The electric drive axle is a key mechanism within the chassis of new energy vehicles, transmitting the motor's speed and torque to the wheels. Currently, the motor in an electric drive axle is often directly connected to a cylindrical gear, which then meshes with other components of the axle to drive the wheels. However, this transmission method results in significant churning losses (power loss caused by idling vehicle components) due to the synchronous rotation of the motor and the subsequent cylindrical gear.

[0032] In response to the above problems, the present invention provides an electric drive axle system, comprising an electric drive axle body, two drive motors, a planetary reduction gear, and a transmission gear, wherein the output shaft of at least one of the two drive motors is transmission-connected to the planetary reduction gear, the planetary reduction gear being located between the drive motor and the transmission gear; the planetary reduction gear comprising a housing, an inner ring gear, a sun gear, planetary gears, and a planet carrier, the inner ring gear being fixedly disposed within the housing, the sun gear being coaxially transmission-connected to the output shaft of the drive motor, the planetary gears being meshingly connected between the sun gear and the inner ring gear, the input shaft of the planet carrier being rotatably connected to the center of the planetary gears, the output shaft of the planet carrier being coaxially transmission-connected to the transmission gear, the transmission gear being transmission-connected to the input end of the electric drive axle body. The electric drive axle system provided by the present invention is provided with a planetary reduction gear at the output shaft end of the drive motor, the drive motor can transmit its own power to the transmission gear in sequence through the sun gear, the planetary gears, and the planet carrier, and then the power is transmitted to the electric drive axle body through the transmission gear, thereby driving the wheels. In this way, even when the motor speed is high, the speed of the transmission gear can be relatively low, thereby reducing oil churning loss.

[0033] Figure 1 is a first structural schematic diagram of an electric drive bridge system provided by an embodiment of the present invention; Figure 2 is a second structural schematic diagram of an electric drive bridge system provided by an embodiment of the present invention; Figure 3 is a third structural schematic diagram of an electric drive bridge system provided by an embodiment of the present invention; Figure 4 is a fourth structural schematic diagram of an electric drive bridge system provided by an embodiment of the present invention. 1 to 4 , an embodiment of the present invention provides an electric drive axle system 100, including an electric drive axle body 110, two drive motors 120, a planetary reduction gear 130, and a transmission gear 140. The output shaft of at least one of the two drive motors 120 is transmission-connected to the planetary reduction gear 130, which is located between the drive motors 120 and the transmission gear 140. The planetary reduction gear 130 includes a housing 131, an inner ring gear 132, a sun gear 133, planetary gears 134, and a planet carrier 135. The inner ring gear 132 is fixedly disposed within the housing 131. The sun gear 133 is coaxially transmission-connected to the output shaft of the drive motor 120. The planetary gears 134 are meshedly connected between the sun gear 133 and the inner ring gear 132. The input shaft of the planet carrier 135 is rotatably connected to the center of the planetary gears 134. The output shaft of the planet carrier 135 is coaxially transmission-connected to the transmission gear 140, which is transmission-connected to the input end of the electric drive axle body 110.

[0034] It can be understood that the electric drive axle body 110 may refer to the part of the electric drive axle in this embodiment other than the drive motor 120, the planetary reduction device 130 and the transmission gear 140. The power output by the drive motor 120 acts on the wheel 200 through the electric drive axle body 110, thereby driving the wheel to move.

[0035] The housing 131 is a box body wrapped around the planetary reduction gear 130 , and mainly protects the internal transmission components. The inner ring gear 132 , the sun gear 133 and the planetary gears 134 can all be arranged inside the housing 131 .

[0036] In the above embodiment, the sun gear 133 may be disposed at the center of the inner gear ring 132 , and the sun gear 133 and the center of the inner gear ring 132 are on a straight line. Specifically, the sun gear 133 may be a cylindrical gear.

[0037] The input shaft of the planet carrier 135 may be the connection end of the planet carrier 135 close to the drive motor 120 in FIG. 1-4 , and the output shaft is the connection end away from the drive motor 120 .

[0038] Among them, when the drive motor 120 rotates, the drive motor 120 can drive the sun gear 133 connected to it to rotate together, and the sun gear 133 drives the planetary gear 134 engaged with it to roll along the meshing teeth on the inner wall of the inner ring 132, thereby driving the planetary carrier 135 to rotate, and the planetary carrier 135 can transmit its own torque to the transmission gear 140 through the output shaft.

[0039] It should be noted that, with reference to Figures 1 and 2 , a planetary reduction device 130 can be provided at both drive motors 120; or, as shown in Figures 3 and 4 , a planetary reduction device 130 can be provided at only one of the drive motors 120. There is no specific limitation on this in the embodiments of the present application.

[0040] The electric drive axle system 100 provided by an embodiment of the present invention is provided with a planetary reduction device 130 at the output shaft end of the drive motor 120. The drive motor 120 can transmit its own power to the transmission gear 140 through the sun gear 133, the planetary gear 134 and the planetary carrier 135 in sequence, and then transmit the power to the electric drive axle body 110 through the transmission gear 140, thereby driving the wheel 200 to move. In this way, even when the motor speed is high, the speed of the transmission gear 140 can be relatively low, thereby reducing oil stirring loss.

[0041] In the above embodiment, the planetary gear 134 can adopt a single cylindrical gear, a double gear, etc. Specifically, as shown in Figure 1, the planetary gear 134 can include at least two cylindrical gears, and the planetary carrier 135 has the same number of input shafts as the cylindrical planetary gears, and each input shaft of the planetary carrier 135 is rotatably connected to the center of a cylindrical planetary gear 134.

[0042] Alternatively, as shown in FIG2 , the planetary gear 134 may include at least two duplex gears, each of which includes a first meshing tooth 1341 and a second meshing tooth 1342. The first meshing tooth 1341 and the second meshing tooth 1342 are coaxial and fixedly connected at intervals. The first meshing tooth 1341 meshes with the inner ring gear 132, and the second meshing tooth 1342 meshes with the sun gear 133. The planetary carrier 135 has the same number of input shafts as the duplex gears, and each input shaft of the planetary carrier 135 is rotatably connected to the center of a duplex gear. In a specific implementation, the diameter of the first meshing tooth 1341 can be made smaller than the diameter of the second meshing tooth 1342. Using duplex gears as the planetary gear 134 can make the transmission smoother, quieter, more efficient, and have a stronger load-bearing capacity.

[0043] The above embodiment may further include a one-way bearing 150, the inner ring of which is mounted on the output shaft of the planetary carrier 135, and the transmission gear 140 is mounted on the outer ring of the one-way bearing 150. The one-way bearing 150 only allows one-way relative rotation between the mounting parts thereon. In one application scenario, when one of the drive motors 120 is driven to drive the wheel 200, the one-way bearing 150 can be arranged on the same side as the drive motor 120 to not allow relative rotation between the transmission gear 140 and the output shaft of the planetary carrier 135. In this way, the planetary carrier 135 can transmit power to the transmission gear 140 via the output shaft, and the transmission gear 140 then transmits the power to the electric drive axle body 110, thereby driving the wheel 200. At the same time, a one-way bearing 150 can be provided on the same side as the other drive motor 120 to allow relative rotation between the transmission gear 140 mounted thereon and the output shaft of the planetary carrier 135. In this way, even if the transmission gear 140 provided on the same side as the drive motor 120 is passively rotated by the electric drive axle body 110, the transmission gear 140 cannot transmit torque to the planetary reduction gear 130 and the drive motor 120, effectively reducing oil churning losses. Of course, as shown in FIG1 , a one-way bearing 150 can also be provided only on the transmission gear 140 on one side of the electric drive axle body 110. The mechanism by which the one-way bearing 150 functions is similar to that described above and will not be further described here.

[0044] In the above embodiment, the two drive motors 120 can be arranged on either side of the electric drive axle body 110 along a first horizontal direction Y. The first horizontal direction Y can be along the length of the vehicle body. Specifically, the two drive motors 120 can be symmetrically arranged to improve the overall stability of the electric drive axle structure.

[0045] As shown in Figures 1 and 2, in the above embodiment, there may be two planetary reduction gears 130, and the two planetary reduction gears 130 may be symmetrically arranged on both sides of the electric drive axle body 110 along the first horizontal direction Y. The two planetary reduction gears 130 may have the same structure, and the symmetrical arrangement of the two planetary reduction gears 130 can simplify the structure of the electric drive axle system 100 and reduce manufacturing costs.

[0046] In the above embodiment, the output shafts of the two drive motors 120 and the output shaft of the planetary carrier 135 can both extend along the second horizontal direction X, and the second horizontal direction X is perpendicular to the first horizontal direction Y. The output shafts of the drive motors 120 and the output shaft of the planetary carrier 135 are aligned in direction, which can improve power transmission efficiency and stability.

[0047] The above embodiment may further include a housing, on which the two drive motors 120 and the planetary reduction gear 130 are mounted. The housing primarily serves as a support and containment member for the various components of the electric drive axle. The housing is generally fixed relative to the vehicle body. In this embodiment, the housings of the drive motors 120 and the planetary reduction gear 130 may be fixedly connected to the housing.

[0048] The electric drive axle system 100 provided in an embodiment of the present invention may include an electric drive axle body 110, two drive motors 120, a planetary reduction gear 130, and a transmission gear 140. The output shaft of at least one of the two drive motors 120 is transmission-connected to the planetary reduction gear 130, and the planetary reduction gear 130 is located between the drive motors 120 and the transmission gear 140. The planetary reduction gear 130 includes a housing 131, an inner ring gear 132, a sun gear 133, planetary gears 134, and a planet carrier 135. The inner ring gear 132 is fixedly disposed within the housing 131. The sun gear 133 is coaxially transmission-connected to the output shaft of the drive motor 120. The planetary gears 134 are meshed and connected between the sun gear 133 and the inner ring gear 132. The input shaft of the planet carrier 135 is rotatably connected to the center of the planetary gears 134. The output shaft of the planet carrier 135 is coaxially transmission-connected to the transmission gear 140. The transmission gear 140 is transmission-connected to the input end of the electric drive axle body 110. The electric drive axle system 100 provided in an embodiment of the present invention is provided with a planetary reduction device 130 at the output shaft end of the drive motor 120. The drive motor 120 can transmit its own power to the transmission gear 140 through the sun gear 133, the planetary gear 134 and the planetary carrier 135 in sequence, and then transmit the power to the electric drive axle body 110 through the transmission gear 140, thereby driving the wheel 200 to move. In this way, even when the motor speed is high, the speed of the transmission gear 140 can be relatively low, thereby reducing oil stirring loss.

[0049] In addition, an embodiment of the present invention further provides a vehicle, which includes any one of the dual-motor electric drive axle systems 100 described in the above embodiments; the electric drive axle system 100 includes an electric drive axle body 110, two drive motors 120, a planetary reduction gear 130, and a transmission gear 140, wherein the output shaft of at least one of the two drive motors 120 is in transmission connection with the planetary reduction gear 130, and the planetary reduction gear 130 is located between the drive motors 120 and the transmission gear 140; the planetary reduction gear 130 includes a housing 131 , annular gear 132, sun gear 133, planetary gears 134 and planetary carrier 135, the inner ring gear 132 is fixedly arranged in the housing 131, the sun gear 133 is coaxially connected to the output shaft of the drive motor 120, the planetary gears 134 are meshed and connected between the sun gear 133 and the inner ring gear 132, the input shaft of the planetary carrier 135 is rotatably connected to the center of the planetary gear 134, the output shaft of the planetary carrier 135 is coaxially connected to the transmission gear 140, and the transmission gear 140 is transmission-connected to the input end of the electric drive axle body 110. The electric drive axle system 100 is provided with a planetary reduction device 130 at the output shaft end of the drive motor 120. The drive motor 120 can transmit its own power to the transmission gear 140 through the sun gear 133, the planetary gears 134 and the planetary carrier 135 in sequence, and then transmit the power to the electric drive axle body 110 through the transmission gear 140, thereby driving the wheels 200 to move. In this way, even when the motor speed is high, the speed of the transmission gear 140 can be relatively low, thereby reducing the oil churning loss of the vehicle.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric drive axle system, characterized in that: The invention comprises an electric drive axle body, two drive motors, a planetary reduction gear, a one-way bearing and a transmission gear, wherein the output shaft of at least one of the two drive motors is transmission-connected with the planetary reduction gear, and the planetary reduction gear is located between the drive motor and the transmission gear; the two drive motors are arranged on both sides of the electric drive axle body along a first horizontal direction; the planetary reduction gear comprises a housing, an inner gear ring, a sun gear, a planetary gear and a planet carrier, the inner gear ring is fixedly arranged in the housing, the sun gear is coaxially transmission-connected with the output shaft of the drive motor, the planetary gear is meshingly connected between the sun gear and the inner gear ring, the input shaft of the planet carrier is rotatably connected with the center of the planetary gear, the output shaft of the planet carrier is coaxially transmission-connected with the transmission gear, and the transmission gear is transmission-connected with the input end of the electric drive axle body; The inner ring of the one-way bearing is mounted on the output shaft of the planet carrier, and the transmission gear is mounted on the outer ring of the one-way bearing; the one-way bearing only allows the mounting parts thereon to rotate relative to each other in one direction; there are two planetary reduction gears, and the two planetary reduction gears are symmetrically arranged on both sides of the electric drive axle body along the first horizontal direction; When one of the drive motors is driven to drive the vehicle to move, the one-way bearing arranged on the same side as the drive motor does not allow relative rotation to occur between the transmission gear and the output shaft of the planetary carrier. The planetary carrier transmits power to the transmission gear through the output shaft, and the transmission gear then transmits power to the electric drive axle body to drive the wheels to move; at the same time, the one-way bearing arranged on the same side as the other drive motor allows relative rotation to occur between the transmission gear installed thereon and the output shaft of the planetary carrier.

2. The electric drive axle system according to claim 1, characterized in that: The planetary gears include two cylindrical gears, and the planetary carrier includes two input shafts. The two input shafts are rotatably connected to the centers of the two planetary gears respectively.

3. The electric drive axle system according to claim 1, characterized in that: The planetary gear includes two double gears, and the double gear includes first meshing teeth and second meshing teeth. The first meshing teeth and the second meshing teeth are coaxial and fixedly connected together at intervals. The first meshing teeth mesh with the inner gear ring, and the second meshing teeth mesh with the sun gear.

4. The electric drive axle system according to claim 3, characterized in that: A diameter of the first meshing tooth is smaller than a diameter of the second meshing tooth.

5. The electric drive axle system according to claim 1, characterized in that: The output shafts of the two drive motors and the output shaft of the planet carrier both extend along a second horizontal direction, and the second horizontal direction is perpendicular to the first horizontal direction.

6. The electric drive axle system according to any one of claims 1 to 5, characterized in that: It also includes a shell, and the two drive motors and the planetary reduction device are both mounted on the shell.

7. A car, characterized in that: An electric drive axle system comprising any one of claims 1-6.

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